CN204367104U - With the composite container baseboard that thick bamboo matter unit combination layer is top layer - Google Patents

With the composite container baseboard that thick bamboo matter unit combination layer is top layer Download PDF

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Publication number
CN204367104U
CN204367104U CN201420750496.XU CN201420750496U CN204367104U CN 204367104 U CN204367104 U CN 204367104U CN 201420750496 U CN201420750496 U CN 201420750496U CN 204367104 U CN204367104 U CN 204367104U
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China
Prior art keywords
layer
deck
bamboo
longitudinal
veneer
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Withdrawn - After Issue
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CN201420750496.XU
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Chinese (zh)
Inventor
许斌
何广贤
潘建荣
杨耀兴
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FOSHAN SHUNDE WOOD Co Ltd
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FOSHAN SHUNDE WOOD Co Ltd
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Abstract

The composite container baseboard that to the utility model relates to thick bamboo matter unit combination layer be top layer, it is characterized in that the sandwich layer that base arrangement comprises upper epidermis, layer and is located between upper epidermis and layer, wherein upper epidermis and layer are the combination layers with longitudinal texture bamboo jigsaw (4) and veneer, and sandwich layer is longitudinal veined wood veneer (2) and cross grain veneer (3), longitudinal texture bamboo jigsaw (4), longitudinal texture improve that to roll one or more in thin bamboo strips used for weaving curtain (5), structure flakeboard (6) superimposed.Advantage: with bamboo jigsaw combination layer for table backing layer, raw material production efficiency is high, quality good, supply is stable, adds that the mechanical property of such bamboo sheet is higher, applies it to top layer, significantly promote the mechanical property of overall sheet material.Adopt adjacent layer veneer gluing, eliminate the loaded down with trivial details technique that the first impregnation of bamboo wood is dried again, heat pressing process employing heat enters the high efficiency production mode that heat goes out, and has production cost low.

Description

With the composite container baseboard that thick bamboo matter unit combination layer is top layer
Technical field
The utility model relates to a kind of composite container baseboard being top layer with thick bamboo matter unit combination layer, belong to the wood-based plate manufacturing technology field in timber industry.
Background technology
Container manufacture requires mechanical property, presentation quality, impact resistance and antiseptic property that base plate is higher.Due to higher to its mechanical property requirements, in the original tropical rain forests in ground such as usual employing Indonesia, Burma, the high-quality hardwood such as clone and A Bidong is peeled into veneer to produce container bottom board, along with the enhancing of global environmental consciousness, the taboo that a lot of country implements original tropical rain forest is cut down, meanwhile the quick-growing plantation resource of China increases fast, as eucalyptus, willow, masson pine and bamboo grove etc., the container bottom board finding non-tropical hardwood plywood class is the expectation of whole industry.
The production of current composite container baseboard normally with bamboo curtain splint, bamboo mat for main raw material(s), automaticity is low, and required artificial many, efficiency is not high.Comparatively speaking, because bamboo mat and bamboo curtain splint mostly are the manual processing of family workshop type, formation efficiency is low, product became uneven, width differ, and the processing and fabricating of bamboo wood is loaded down with trivial details, and raw-material buying is subject to seasonal restrictions.When purchasing in a large number, raw material supply is not gone up, and which limits and manufactures high-performance composite container baseboard.
Now by a kind of processing mode, circle bamboo is rolled after leveling through normal temperature, brush away or plane or split the surf green tabasheer of impact gummed and wide processing, the bamboo chip thickness obtained like this is thicker, wider width, and its horizontally-spliced one-tenth one deck bamboo is spelled material plate, add that the mechanical property of such bamboo kind is higher, apply it to top layer, the advantage that it significantly promotes in the mechanical property of sheet material table backing layer to entire plate can be played.Also have glue consumption when manufacturing few, be convenient to the cost control of container bottom board.Container bottom board produced by the sustainable domestic bamboo timber that such available resources enriches, and widened the source of base plate material, had far-reaching realistic meaning.
Summary of the invention
The utility model proposes a kind of composite container baseboard being top layer with thick bamboo matter unit combination layer, day by day rare for the high-quality hardwood resource in existing container bottom board technology, and bamboo mat and bamboo curtain splint mostly are the manual processing of family workshop type, production efficiency is low, the quality of product is low, and the processing and fabricating of these two kinds of bamboo materials is loaded down with trivial details, buying is subject to seasonal restrictions, and have the shortcomings such as Outer part and inner part of the bamboo, a kind of large format of splicing is provided to roll the bamboo jigsaw of leveling without yellow normal temperature without green grass or young crops, be used as the table back of the body combination layer material of composite container baseboard, the material such as artificial forest wood and bamboo wood of compound fast-growing makes composite container baseboard again.
Technical solution of the present utility model: a kind of composite container baseboard that is top layer with thick bamboo matter unit combination layer, its structure is the sandwich layer that base arrangement comprises upper epidermis, layer and is located between upper epidermis and layer, wherein upper epidermis and layer are the combination layers with longitudinal texture bamboo jigsaw and veneer, and sandwich layer is longitudinal veined wood veneer and cross grain veneer, longitudinal texture bamboo jigsaw, longitudinal texture improve that to roll one or more in thin bamboo strips used for weaving curtain, structure flakeboard superimposed.
Advantage of the present utility model: with bamboo jigsaw combination layer for table backing layer, raw material production efficiency is high, quality good, supply is stable, adds that the mechanical property of such bamboo sheet is higher, applies it to top layer, significantly promote the mechanical property of overall sheet material.Adopt adjacent layer veneer gluing, eliminate the loaded down with trivial details technique that the first impregnation of bamboo wood is dried again, heat pressing process employing heat enters the high efficiency production mode that heat goes out, and has the advantage that production cost is low.Resourceful sustainable domestic bamboo timber can be utilized like this to produce container bottom board, widened the source of base plate material, there is far-reaching realistic meaning.
Accompanying drawing explanation
Fig. 1 is with the structural representation of thick bamboo matter unit combination layer composite container baseboard first embodiment that is top layer.
Fig. 2 is with the structural representation of thick bamboo matter unit combination layer composite container baseboard second embodiment that is top layer.
Fig. 3 is with the structural representation of thick bamboo matter unit combination layer composite container baseboard the 3rd embodiment that is top layer.
Fig. 4 is with the structural representation of thick bamboo matter unit combination layer composite container baseboard the 4th embodiment that is top layer.
In accompanying drawing, 1 be hard paper, 2 are longitudinal texture Wooden veneers, 3 are cross grain Wooden veneers, 4 to be longitudinal texture bamboo jigsaw, 5 be that longitudinal texture improves that to roll thin bamboo strips used for weaving curtain, 6 are structure flakeboards.
Detailed description of the invention
A kind of composite container baseboard that is top layer with thick bamboo matter unit combination layer, it is characterized in that the sandwich layer that base arrangement comprises upper epidermis, layer and is located between upper epidermis and layer, wherein upper epidermis and layer are the combination layers with longitudinal texture bamboo jigsaw (4) and veneer, and sandwich layer is longitudinal veined wood veneer (2) and cross grain veneer (3), longitudinal texture bamboo jigsaw (4), longitudinal texture improve that to roll one or more in thin bamboo strips used for weaving curtain (5), structure flakeboard (6) superimposed.
Described longitudinal texture bamboo jigsaw (4), that circle bamboo is cutd open into two panels, levelling means processing is rolled again through efficient normal temperature, this equipment carries out wide indentation by scoring knife, then make it flatten, then by the mode of planing or split the thin bamboo strip, its tabasheer surf green is removed, and the medicine pressurizeed after first vacuum impregnates the pest control and anticorrosion process of pest control and anticorrosion process or more than 160 DEG C modifications in hot and humid 3 hours, again after drying by horizontal overuse equipment, the nothing being processed into uniform thickness is blue or green without bambusa textile jigsaw.
Described with the combination layer of longitudinal texture bamboo jigsaw (4) and veneer, be followed successively by longitudinal veined wood veneer (2) of one deck, one deck cross grain veneer (3) inwards from table, then be one deck longitudinal direction texture bamboo jigsaw (4), the bamboo strip of this bamboo jigsaw outwardly; Also can be followed successively by longitudinal veined wood veneer (2) of one deck inwards from table with the combination layer of longitudinal texture bamboo jigsaw (4) and veneer, be then longitudinal texture bamboo jigsaw (4) of one deck, the bamboo strip of this longitudinal texture bamboo jigsaw outwardly; Being followed successively by longitudinal texture bamboo jigsaw (4) of one deck inwards with the combination layer of longitudinal texture bamboo jigsaw (4) and veneer or from table, is then one deck cross grain veneer (3).So that one deck hard paper or phenolic impregnated non-woven fabrics can be covered outside the combination layer of longitudinal texture bamboo jigsaw (4) and veneer.
Described base arrangement, from outside to inside to being called longitudinal veined wood veneer (2) of one deck hard paper (1), one deck, one deck cross grain veneer (3), is then longitudinal texture bamboo jigsaw (4) of one deck; Sandwich layer is folder seven layers of longitudinal veined wood veneer (2) in two-layer cross grain veneer (3), this slab totally 15 layers.
Described base arrangement, from outside to inside to being called longitudinal veined wood veneer (2) of one deck hard paper (1), one deck, one deck cross grain veneer (3), is then longitudinal texture bamboo jigsaw (4) of one deck; Sandwich layer is inwardly to being called one deck cross grain veneer (3) and two-layer longitudinal veined wood veneer (2), and most intermediate layer is longitudinal texture bamboo jigsaw (4) of one deck.
Described base arrangement, from outside to inside to being called longitudinal veined wood veneer (2) of one deck, is then longitudinal texture bamboo jigsaw (4) of one deck; Be inwardly longitudinal veined wood veneer (2) of two-layer cross grain veneer (3) folder one deck again, more inwardly for the longitudinal texture improvement of one deck rolls thin bamboo strips used for weaving curtain (5), most intermediate layer is a longitudinal veined wood veneer (2).
Described base arrangement to being called longitudinal texture bamboo jigsaw (4) of one deck hard paper (1), one deck, is then one deck cross grain veneer (3) from outside to inside; Sandwich layer is structure flakeboard (6).
Its manufacture method, comprises following processing step:
A, bamboo jigsaw, veneer, improvement roll thin bamboo strips used for weaving curtain and the sorting of structure flakeboard and arrangement, bamboo jigsaw and improvement are rolled thin bamboo strips used for weaving curtain and is dried to moisture content less than 10%, and improve and roll thin bamboo strips used for weaving curtain after dipping phenol glue, low temperature drying is to moisture content 12 ~ 18%; Veneer drying to moisture content≤10%, double spread phenol glue; The sanding of structure flakeboard is to 22mm, and double spread phenol glue, glue-spread is 180 g/m 2(two-sided), adds the pesticide of 2.4 grams by 1 kilogram of glue (solid content 45%) in glue;
B, assembly and hot pressing, using bamboo jigsaw combination layer as table backing layer, sandwich layer is veneer, bamboo jigsaw, improve roll thin bamboo strips used for weaving curtain and structure flakeboard assembly; Then be 135 ~ 145 DEG C in temperature, pressure is carry out hot pressing under the condition of 1.8 ~ 3.0MPa, keeps 15 ~ 35 minutes, then steam discharge, step-down and release.
embodiment 1
A kind of composite container baseboard that is top layer with thick bamboo matter unit combination layer, as shown in Figure 1, the sandwich layer comprising upper epidermis bamboo jigsaw combination layer, layer bamboo jigsaw combination layer and be located between upper epidermis and layer, bamboo jigsaw combination layer is followed successively by one deck hard paper 1, the longitudinal veined wood veneer 2 of one deck, one deck cross grain veneer 3 inwards from table, is then one deck longitudinal texture bamboo jigsaw 4; Sandwich layer is press from both sides seven layers of longitudinal veined wood veneer 2, totally 15 layers in two-layer cross grain veneer 3.
A manufacture method for the composite container baseboard being top layer with thick bamboo matter unit combination layer, the method comprises following processing step:
A, Wooden veneer, the sorting of bamboo jigsaw and arrangement, Wooden veneer moisture content≤10%, according to required double spread, glue-spread 340g/m 2, ageing or low temperature drying, add the pesticide of 2.4 grams by 1 kilogram of glue (solid content 45%) in glue; And longitudinal texture bamboo jigsaw 4 is dried to moisture content less than 11%;
B, assembly and hot pressing, paving structure be sandwich layer be seven layers of longitudinal veined wood veneer 2 up and down respectively for two-layer cross grain veneer 3, be respectively outwards one deck longitudinal texture bamboo jigsaw 4 again, be the longitudinal veined wood veneer 2 of one deck cross grain Wooden veneer 3 and one deck at the skin of longitudinal texture bamboo jigsaw 4, outermost layer is one deck hard paper 1.Be 140 DEG C in temperature, maximum pressure is carry out hot pressing under the condition of 2.5MPa, and heating platen temperature keeps 35 minutes after 135 DEG C, then pressure drop stage and release.
Through sanding, saw cuts out and after fluting processing, can obtain the finished product composite container baseboard of 28.5mm, its physical and mechanical property is as follows:
MOR∥:≥ 100 MPa;
MOR⊥:≥ 35 MPa;
MOE∥:≥ 10000 MPa;
MOE⊥:≥ 3500 MPa;
Density: 0.75 ~ 0.90g/cm 3.
embodiment 2
A kind of composite container baseboard that is top layer with thick bamboo matter unit combination layer, as shown in Figure 2, the sandwich layer comprising upper epidermis bamboo jigsaw combination layer, layer bamboo jigsaw combination layer and be located between upper epidermis and layer, bamboo jigsaw combination layer is followed successively by one deck hard paper 1, the longitudinal veined wood veneer 2 of one deck, one deck cross grain veneer 3 inwards from table, then be one deck longitudinal texture bamboo jigsaw 4, sandwich layer is inwardly to being called one deck cross grain veneer 3 and two-layer longitudinal veined wood veneer 2, and most intermediate layer is one deck longitudinal texture bamboo jigsaw 4.Slab totally 13 layers.
A manufacture method for the composite container baseboard being top layer with thick bamboo matter unit combination layer, the method comprises following processing step:
A, Wooden veneer, the sorting of bamboo jigsaw and arrangement, Wooden veneer moisture content≤10%, according to required double spread, glue-spread 340g/m 2, ageing or low temperature drying, add the pesticide of 2.4 grams by 1 kilogram of glue (solid content 45%) in glue; And longitudinal texture bamboo jigsaw 4 is dried to moisture content less than 10%;
B, assembly and hot pressing, paving structure is middle is that one deck longitudinal texture bamboo jigsaw 4 is followed successively by two layers of longitudinal veined wood veneer 2, one deck cross grain veneer 3 to external symmetry, be outwards one deck longitudinal texture bamboo jigsaw 4, one deck cross grain veneer 3, the longitudinal veined wood veneer 2 of one deck again, outermost layer is one deck hard paper 1.Be 145 DEG C in temperature, maximum pressure is carry out hot pressing under the condition of 2.5MPa, and heating platen temperature keeps 35 minutes after 135 DEG C, then pressure drop stage and release.
Through sanding, saw cuts out and after fluting processing, can obtain the finished product composite container baseboard of 28.5mm, its physical and mechanical property is as follows:
MOR∥:≥ 100 MPa;
MOR⊥:≥ 35 MPa;
MOE∥:≥ 10000 MPa;
MOE⊥:≥ 3500 MPa;
Density: 0.75 ~ 0.90g/cm 3.
embodiment 3
A kind of composite container baseboard that is top layer with thick bamboo matter unit combination layer, as shown in Figure 3, the sandwich layer comprising upper epidermis bamboo jigsaw combination layer, layer bamboo jigsaw combination layer and be located between upper epidermis and layer, bamboo jigsaw combination layer is followed successively by the longitudinal veined wood veneer 2 of one deck and one deck longitudinal texture bamboo jigsaw 4 inwards from table, sandwich layer inwardly presss from both sides the longitudinal veined wood veneer 2 of one deck to being called in two-layer cross grain veneer 3, inwardly roll thin bamboo strips used for weaving curtain 5 for one deck improves again, most intermediate layer is the longitudinal texture veneer 2 of one deck.Totally 13 layers.
A manufacture method for the composite container baseboard being top layer with thick bamboo matter unit combination layer, the method comprises following processing step:
A, Wooden veneer, bamboo jigsaw and improvement roll the sorting of thin bamboo strips used for weaving curtain and arrangement, Wooden veneer moisture content≤10%, according to required double spread, and glue-spread 340g/m 2, ageing or low temperature drying; And longitudinal texture bamboo jigsaw and improvement are rolled thin bamboo strips used for weaving curtain be dried to moisture content less than 10%, improve low temperature drying after rolling thin bamboo strips used for weaving curtain impregnation and, to moisture content 12 ~ 18%, in glue, add the pesticide of 2.4 grams by 1 kilogram of glue (solid content 45%);
B, assembly and hot pressing, paving structure is from outside to inside to being called: the longitudinal veined wood veneer 2 of one deck and one deck longitudinal texture bamboo jigsaw 4, then for pressing from both sides the longitudinal veined wood veneer 2 of one deck in two-layer cross grain veneer 3, inwardly roll thin bamboo strips used for weaving curtain 5 for one deck improves again, most intermediate layer is the longitudinal texture veneer 2 of one deck.Be 145 DEG C in temperature, maximum pressure is carry out hot pressing under the condition of 2.5MPa, and heating platen temperature keeps 35 minutes after 135 DEG C, then pressure drop stage and release.
After conventional post-production, can obtain finished product composite container baseboard, its physical and mechanical property is as follows:
MOR∥:≥ 105 MPa;
MOR⊥:≥ 35 MPa;
MOE∥:≥ 11000 MPa;
MOE⊥:≥ 3500 MPa;
Density: 0.75 ~ 0.90g/cm 3.
embodiment 4
A kind of composite container baseboard that is top layer with thick bamboo matter unit combination layer, as shown in Figure 4, the sandwich layer comprising upper epidermis bamboo jigsaw combination layer, layer bamboo jigsaw combination layer and be located between upper epidermis and layer, bamboo jigsaw combination layer is followed successively by one deck hard paper 1, one deck longitudinal texture bamboo jigsaw 4, in layer cross grain veneer 3 inwards from table, and sandwich layer is a special oriented wood chipboard 6.
A manufacture method for the composite container baseboard being top layer with thick bamboo matter unit combination layer, the method comprises following processing step:
A, Wooden veneer, the sorting of bamboo jigsaw and arrangement Wooden veneer moisture content≤10%, according to required double spread, glue-spread 320g/m 2, ageing or low temperature drying, add the pesticide of 2.4 grams by 1 kilogram of glue (solid content 45%) in glue; And longitudinal texture bamboo jigsaw is dried to moisture content less than 11%;
The compacting of b, special oriented wood chipboard and process, the structure of this oriented wood chipboard is 5 Rotating fields, middle flaking (strand) is for mat formation at random, be outwards transversely arranged directed flaking layer again, outermost layer is the flaking layer of longitudinal arrangement, adopt phenol glue or isocyanates (MDI), design thickness of slab is 23.5mm, and density is 0.80 g/cm 3.After compacting, sanding is to 22mm, and at its surface coating phenol glue, glue-spread is 180 g/m 2(two-sided);
C, assembly and hot pressing are respectively one deck cross grain veneer 3 outward at oriented wood chipboard sandwich layer up and down, then are respectively outwards one deck longitudinal texture bamboo jigsaw 4, are one deck hard paper 1 at the skin of longitudinal texture bamboo jigsaw 4.Be 145 DEG C in temperature, maximum pressure is carry out hot pressing under the condition of 2.0MPa, and heating platen temperature keeps 15 minutes after 135 DEG C, then pressure drop stage and release.
After conventional post-production, can obtain finished product composite container baseboard, its physical and mechanical property is as follows:
MOR∥:≥ 100 MPa;
MOR⊥:≥ 30 MPa;
MOE∥:≥ 10000 MPa;
MOE⊥:≥ 3000 MPa;
Density: 0.75 ~ 0.90g/cm 3.

Claims (7)

1. the composite container baseboard that is top layer with thick bamboo matter unit combination layer, it is characterized in that the sandwich layer that base arrangement comprises upper epidermis, layer and is located between upper epidermis and layer, wherein upper epidermis and layer are the combination layers with longitudinal texture bamboo jigsaw (4) and veneer, and sandwich layer is longitudinal veined wood veneer (2) and cross grain veneer (3), longitudinal texture bamboo jigsaw (4), longitudinal texture improve that to roll one or more in thin bamboo strips used for weaving curtain (5), structure flakeboard (6) superimposed.
2. a kind of composite container baseboard that is top layer with thick bamboo matter unit combination layer according to claim 1, it is characterized in that described longitudinal texture bamboo jigsaw (4), that circle bamboo is cutd open into two panels, levelling means processing is rolled again through efficient normal temperature, this equipment carries out wide indentation by scoring knife, then it is made to flatten, by the mode of planing or split the thin bamboo strip, its tabasheer surf green is removed again, and the medicine pressurizeed after first vacuum impregnates the pest control and anticorrosion process of pest control and anticorrosion process or more than 160 DEG C modifications in hot and humid 3 hours, again after drying by horizontal overuse equipment, the nothing being processed into uniform thickness is blue or green without bambusa textile jigsaw.
3. a kind of composite container baseboard that is top layer with thick bamboo matter unit combination layer according to claim 1, it is characterized in that described with the combination layer of longitudinal texture bamboo jigsaw (4) and veneer, longitudinal veined wood veneer (2) of one deck, one deck cross grain veneer (3) is followed successively by inwards from table, then be longitudinal texture bamboo jigsaw (4) of one deck, the bamboo strip of this bamboo jigsaw outwardly; Also can be followed successively by longitudinal veined wood veneer (2) of one deck inwards from table with the combination layer of longitudinal texture bamboo jigsaw (4) and veneer, be then longitudinal texture bamboo jigsaw (4) of one deck, the bamboo strip of this longitudinal texture bamboo jigsaw outwardly; Being followed successively by longitudinal texture bamboo jigsaw (4) of one deck inwards with the combination layer of longitudinal texture bamboo jigsaw (4) and veneer or from table, is then one deck cross grain veneer (3); One deck hard paper or phenolic impregnated non-woven fabrics is covered outward with the combination layer of longitudinal texture bamboo jigsaw (4) and veneer.
4. a kind of composite container baseboard that is top layer with thick bamboo matter unit combination layer according to claim 1, it is characterized in that: described base arrangement, from outside to inside to being called longitudinal veined wood veneer (2) of one deck hard paper (1), one deck, one deck cross grain veneer (3), is then longitudinal texture bamboo jigsaw (4) of one deck; Sandwich layer is folder seven layers of longitudinal veined wood veneer (2) in two-layer cross grain veneer (3), totally 15 layers.
5. a kind of composite container baseboard that is top layer with thick bamboo matter unit combination layer according to claim 4, it is characterized in that: described base arrangement, from outside to inside to being called longitudinal veined wood veneer (2) of one deck hard paper (1), one deck, one deck cross grain veneer (3), is then longitudinal texture bamboo jigsaw (4) of one deck; Sandwich layer is inwardly to being called one deck cross grain veneer (3) and two-layer longitudinal veined wood veneer (2), and most intermediate layer is longitudinal texture bamboo jigsaw (4) of one deck.
6. a kind of composite container baseboard that is top layer with thick bamboo matter unit combination layer according to claim 4, is characterized in that: described base arrangement to being called longitudinal veined wood veneer (2) of one deck, then be one deck longitudinal direction texture bamboo jigsaw (4) from outside to inside; Be inwardly longitudinal veined wood veneer (2) of two-layer cross grain veneer (3) folder one deck again, more inwardly for the longitudinal texture improvement of one deck rolls thin bamboo strips used for weaving curtain (5), most intermediate layer is a longitudinal veined wood veneer (2).
7. a kind of composite container baseboard that is top layer with thick bamboo matter unit combination layer according to claim 4, it is characterized in that: described base arrangement to being called longitudinal texture bamboo jigsaw (4) of one deck hard paper (1), one deck, is then one deck cross grain veneer (3) from outside to inside; Sandwich layer is structure flakeboard (6).
CN201420750496.XU 2014-12-04 2014-12-04 With the composite container baseboard that thick bamboo matter unit combination layer is top layer Withdrawn - After Issue CN204367104U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104476630A (en) * 2014-12-04 2015-04-01 佛山市顺德区东顺木业有限公司 Compound container bottom plate with thick bamboo unit assembly layers as surface layers and manufacturing method of compound container bottom board

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104476630A (en) * 2014-12-04 2015-04-01 佛山市顺德区东顺木业有限公司 Compound container bottom plate with thick bamboo unit assembly layers as surface layers and manufacturing method of compound container bottom board

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